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Finding the Fourth Proportional to 1,405,531.72, 1,939,597.86 and 785,341.72

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Solution

The fourth proportional to 1,405,531.72, 1,939,597.86 and 785,341.72 is: 1,083,751.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,405,531.72 : 1,939,597.86 = 785,341.72 : x
  2. Step 2: Convert to fraction form
    1,405,531.72/1,939,597.86 = 785,341.72/x
  3. Step 3: Cross multiply
    1,405,531.72x = 1,939,597.86 × 785,341.72
  4. Step 4: Simplify right side
    1,405,531.72x = 1,523,247,119,480.72
  5. Step 5: Solve for x
    x = 1,523,247,119,480.72/1,405,531.72
  6. Step 6: Final answer
    x = 1,083,751.51

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.